19th / 20th Oct 2010
Today (19th ), we waited for an afternoon departure in order to address the issue of the ‘Shallows’ down to the Gold Coast Seaway. For reasons I couldn’t pin down, as we waited I was in an uncomfortable frame of mind all morning about our plan (My Plan!). Noting that the shoals at Jacobs Well are but 800mm at low tide, we needed at least a 1m of tide to even hope to make it across, let alone do it with any degree of comfort. What we also needed was to make it through the shallows and on to the Gold Coast before dark as the navigation here is just too intricate for non-locals at night.(Note the labyrith in the Google image left)
The prediction I had, had a High of just under 1.3 at around 18:30 but I just couldn’t achieve total confidence in the data as there were a number of conflicts. This data, you see, was critical as my plan was to cross the shoals at 16:30 to give us time to get to our anchorage and although not full, the tide should be just adequate - by my calculations!
Now, when it comes to tides, there are principal port (real data) , secondary ports (valid differentials from nearby ‘real data’) and place where one simply has to extrapolate from what ever information is available. Jacobs well, as treacherous as it is, is one of the latter and as a result, there were a number of anomalies in the data I had, across both time a magnitude. As both these were critical, I fidgeted all morning and just kept looking until eventually, with the aid of a site that Paul found and a phone call to Jacob’s Well, I finally determined the tide to be much later at nearly 19:15. With this new knowledge I amended the plan to motor to the start of the shoals, anchor for the night and cross on the morning tide which I now confidently knew to be 08:05.
With morning (20th), we found a grey, wet and windy day as we executed the plan. I am pleased to report we did this and achieved exactly the results I was seeking. This was made a little tough by low visibility in the rain but all in all it went off well. The remainder of the trip down the channel was mostly straight forward but for some more heavy rain and a few winds gusts up to 27 kts or so.
Anchoring in what known among cruisers as ”Bum’s Bay” just off Sea World, we are drying out and enjoying some hot drinks as we settle in for the day.